/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.hadoop.fs.statistics.impl;

import org.apache.hadoop.fs.statistics.DurationTracker;
import org.apache.hadoop.fs.statistics.DurationTrackerFactory;

/**
 * This is a stub factory which always returns no-op duration
 * trackers. Allows for code to always be handed a factory.
 */
public final class StubDurationTrackerFactory
    implements DurationTrackerFactory {

  /**
   * Single instance.
   */
  public static final StubDurationTrackerFactory STUB_DURATION_TRACKER_FACTORY
      = new StubDurationTrackerFactory();

  private StubDurationTrackerFactory() {
  }

  @Override
  public DurationTracker trackDuration(final String key, final long count) {
    return StubDurationTracker.STUB_DURATION_TRACKER;
  }
}
